Study of Jet Quenching with $Z+\text{jet}$ Correlations in Pb-Pb and $pp$ Collisions at ${\sqrt{s}}_{NN}=5.02\text{ }\text{ }\mathrm{TeV}$

The collaboration
Phys.Rev.Lett. 119 (2017) 082301, 2017.

Abstract
The production of jets in association with Z bosons, reconstructed via the mu+mu- and e+e- decay channels, is studied in pp and, for the first time, in PbPb collisions. Both data samples were collected by the CMS experiment at the LHC, at a nucleon-nucleon center-of-mass energy of 5.02 TeV. The PbPb collisions were analyzed in the 0-30% centrality range. The back-to-back azimuthal alignment was studied in both pp and PbPb collisions for Z bosons with transverse momentum p[tz] > 60 GeV/c and a recoiling jet with p[tj] > 30 GeV/c. The pt imbalance, x[jz] = p[tj] / p[tz], as well as the average number of jet partners per Z, R[jz], were studied in intervals of p[tz], in both pp and PbPb collisions. The R[jz] is found to be smaller in PbPb than in pp collisions, which suggests that in PbPb collisions a larger fraction of partons, associated with the Z bosons, lose energy and fall below the 30 GeV/c p[tj] threshold.

• #### Table 1

Data from top panel of Fig. 2

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Distribution of the azimuthal angle difference between the Z boson and the jet in pp collisions. The distribution is normalized...

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Data from top panel of Fig. 2

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Distribution of the azimuthal angle difference between the Z boson and the jet in PbPb collisions. The distribution is normalized...

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Data from bottom panel of Fig. 2

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Distribution of the transverse momentum ratio between the Z boson and the jet in pp collisions. The distribution is normalized...

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Data from bottom panel of Fig. 2

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Distribution of the transverse momentum ratio between the Z boson and the jet in PbPb collisions. The distribution is normalized...

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Data from top panel of Fig. 3

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The mean value of the X_JZ distribution in pp collisions. The resolutions of the measured jet energy and azimuthal angle...

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Data from top panel of Fig. 3

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The mean value of the X_JZ distribution in PbPb collisions.

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Data from bottom panel of Fig. 3

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The average number of jet partners per Z boson in pp collisions. The resolutions of the measured jet energy and...

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Data from bottom panel of Fig. 3

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The average number of jet partners per Z boson in PbPb collisions.

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Data from top panel of Fig. 4

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Distribution of the transverse momentum ratio between the Z boson and the jet in pp collisions. The distribution is normalized...